perf(devtools): move diff to devDependencies (#1060)

Author: antfu

packages/devtools/package.json

@@ -69,7 +69,6 @@
 "birpc": "catalog:frontend",
 "consola": "catalog:prod",
 "destr": "catalog:prod",
-"diff": "catalog:frontend",
 "error-stack-parser-es": "catalog:frontend",
 "fast-npm-meta": "catalog:prod",
 "hookable": "catalog:frontend",
@@ -109,6 +108,7 @@
 "@vitejs/devtools": "catalog:buildtools",
 "@vueuse/nuxt": "catalog:buildtools",
 "cronstrue": "catalog:frontend",
+"diff": "catalog:frontend",
 "exsolve": "catalog:buildtools",
 "floating-vue": "catalog:frontend",
 "fuse.js": "catalog:frontend",